Feeding mechanism for sewing machines



ly 2791943. J, HEGG|E FEEDING MECHANISM FOR SEWING MACHINES Filed Nov. l2, 1941 2 Sheets-Sheet l Aww.

@in James /L/eggle a Suoww July 27, 1943. 1 HEGGIE FEEDING MECHANISM FOR SEWING MACHINES Filed Nov. 12, i941 2 Sheets-Sheet 2 Patented July 27, 1943 rem MECHANISM Fonl SEWING MACHINES e James He'ggie, Clydebank, Scotland, assignor `to ,1

The Singer Manufacturing Company, Eliza- 1 beth, N. J., a corporation of New Jersey Application November 12, 1941', summa-418,821 Y In Great Britain November 11, 1,940 l ,5,c1airm1s. (01.112-215) `'('Grantedjincler theY provisions lof sec. 14, act,v cf- Marcha, 1927; 357 o. G. 5) I This invention relates to feeding mechanism for sewing machines, more particularly applicable to sewing machines ofthe type formed with a cylindrical work-arm as used, for example, inthe stitching and trimming of footwear.

An object of the invention is to produce a construction in which the `free end or head.; of the work-arm is `rendered vcompact by reason vthat certain elements ofthe feeding (mechanism, in lieu of beinglocated in the work-arm head, are located within the contour of the, armbut spaced from, i. e., rearwardoL-said head.

Feeding mechanism accordingto the invention includes a feed-dog-carrier mounted 'gwithinthe work-arm head on the forward end `of a -feedshaft which is operatively connected within `the body of the work-arm to a feed-rock-shaft, and a feed-lift-shaft journalled Within thegwork-arm and carrying a bracket xed thereto in which said feed-shaft is journalled, said feed-rock-shaft and said feed-lift-shaft deriving actuation from the main or upper shaft of the sewing machine.

The invention is illustrated in the accompanying drawings in which Fig. 1 is a side elevation of a sewing machine incorporating the improved feeding mechanism.Y Fig. 2 is a fragmentary transverse vertical section mainly on the line A-A of Fig. 1. Fig. 3 is a vertical transverse section on the line BV-B of Fig. l. Fig. 4 is an end elevation looking on the front end ofthe work-arm. Figs. 3 and 4 are drawn to a larger scale than Figs. 1 and 2. Y

Referring to the drawings, denotes a cylindrical work-arm, 2I a standard uprising from the rear end of the work-arm 20, 'and 22 an overhanging bracket-arm terminating in a head 23, constituting the frame of the sewing machine.

Journalled in the bracket-arm 22 Vis, a main shaft 24 provided at its rear end with a driving pulley and flywheel 25 and at its front end witha crank disc 26 which drives, through the medium of a connecting rod 2l, a reciprocatory needlebar 28 which is journalled in the head 23 and is equipped at its lower end with a needle 29. 30 denotes a presser-bar also mounted in the head 23 and equipped at its lower end with a bracket Y 3l to which is connected an arm 32 carrying a presser-wheel 33 which co-operates with a feedthe feed-dog-c'arrier deriverising and falling movements from a feed-lift-shaft 5 `journalled within the work-arm 20 and having fixed on its rear end a crank-arm 5 which is operatively connected tothe lowerend of a pitman 6 ofwhich the upper end isformedas astrap 6, embracing an eccentric 3,4 secured `on theemain shaft 24. Fixed to the shaft 5,'within the work-arm 20, is abracket 'I in which is journalled-eccentrically of thershaft 5, the feedshaft v8. lMounted on the rear `end of thefeed-shaft 8, Vwithina laterally exposed body part of the work-arm 2B, is a-forked lever 9 which slidably-,stra-ddles a-bush Ii) journalled Von-a boss- I Ifcarried by, a lever I2 secured on the forward end of. alshort feed-rock-shaft I3 journalled within the work-.arm 20, the lconstruction being suchthat the feed-shaft 8` rises and falls under the action of the shaft 5 and is also oscillated, i. e., performs feeding movements, about its own axis under the action of the feedrock-shaft I3. Fixed on the rear end of the feedrock-shaft I3 is a crank-arm I3 to which is operatively connected the lower end of a pitman dog 2 projecting upwardly through a throat- I4 provided at its upper end with a strap I4 embracing an eccentric 35 secured on the main shaft 24.

The loop-taker 4 is secured on the forward end of a shaft I5 journalled within the work-arm 20 and loosely surrounded by the boss I I. At its rear end the shaft I5 is connected by bevel gear wheels 31, 38 with the lower end of an upright shaft 39 connected at its upper end by bevel gear wheels 40, 4l with the shaft 24.

Lateral cut-aways 20 in the work-arm 20 permit ready access to the feed-actuating mechanism.

What is claimed is:

1. In a'sewing machine having a frame including a bracket-arm and a work-arm formed with a head, in combination, a main shaft journalled in said bracket-arm, a feed-rock-shaft journalled within said work-arm, a feed-lit-shaft journalled within said Work-arm, a bracket fixed to said feed-lift-shaft within said Work-arm, a feed-shaft journalled in said bracket and eccentric to said eed-lift-shaft, operative connections within the body of said work-arm for communieating oscillatory movements to said feed-shaft from said feed-rock-shaft, a feed-dog carrier mounted within the head of said work-'arm on the forward end of said feed-shaft, and operative connections between said feed-rock-shaft and feed-lift-shaft and said main shaft.

2. In a sewing machine having a frame including a bracket-arm and a work-arm formed with a head, in combination, a main shaft journalled in said bracket-arm, a feed-rock-shaft journalled within said work-arm, a lever secured on the forward end et'saiid4 feed-rock-shaft,Y a bush mounted on said lever, a feed-lift-shaft `journalled within said work-arm, a bracket xed to said feed-lift-shaft, a feed-shaft journalled in Y said bracket and eccentric to said ieed-lift.shat a forked lever mounted on the rear end of feed-shaft within the body of said work-arm and slidably engaging said bushwhereby oscillatory movements are imparted to :said feed-shaftv by said feed-rock-shaft, a'feed-dog carriermountedr within the head of said werk-arm en the mit-- ward end of said feed-shaft, and onerativeeonnections between said feed-rock-shaft and feed lift-shaft and said main shaft.

3. VIn a sewing machine having aframe includ--. ing a bracket-arm and a work-arm formed with.

of said work-armandisl-idably'rengagirig;

bush, `whereby oscillatory movements are; imparted to said` fced-Shat bysaid feed-rock-shaft, a feed-dbg carrier mounted within the head of said work-arm on the forward end of said feedshaft, and operative connections between said feed-rock-shaft and feed-lift-shaft and said nia-in shaft. n

' i 4. In. a, sewing machine having a frame includfeed-litvshaftwthin said work-arm, a feedshatonrnaziied m'said bracket, a pair of intereonnected'levers-within the body of said workarm. carried,A respectively, by said feed-shaft and said feed-roek-shaft, a feed-dog carrier mounted t saidfeed-mck-shaft and feed-lift-shaft and said main shaft.

i 5.- In a sewingrnachine having a. frame including a bracket-arm andrawork-arm formed with a fread, in combination, a, maink shaft j ournalled in1 said.bracketz-arm,Y a feed-rock-sha'ft journalled within said work-arm, a feed-lift-shaft. jour- 11a-lied witibinfsaid wcmic-armT a bracket fixed to said feed-Iit-'shaftiwithin said: Work-arm, a feedshaft ournalled ini-said bracket and eccentric to saidl feedf-IifEt-shaft, connectionsy within the body of said work-arm fior communicating feeding movementsfrom saidf feed-rock-shaftv toy said feed-shaft, a feed-dog" carrier mounted within the head1' of sai'd. work-arm. on. the forward. end of 'said` feed-shaft, andi operative connections between said 'a feed-rock-shaft andi feed-lift-shaft and saidl main shaft'. Y

y JAMFS HEGGIE.. 

